# Heirloom

**Canonical:** https://apis.io/providers/heirloom/  
**Website:** https://www.heirloomcarbon.com/  
**APIs profiled:** 0

Heirloom Carbon Technologies, Inc. is a San Francisco Bay Area direct air capture (DAC) company that removes carbon dioxide from the atmosphere by accelerating the natural mineralization of limestone. Heirloom spreads calcium oxide on vertical trays where it re-absorbs atmospheric CO2 in days rather than years, then uses electric kilns to release the captured CO2 for permanent geologic or in-concrete storage. The company opened the first commercial DAC facility in the United States, sells permanent carbon removal credits to individuals, businesses and enterprises, and has signed offtake agreements with Microsoft, Frontier, United's Sustainable Flight Fund and CarbonCure. It is an industrial climate-technology company; it does not operate a public developer program or API.

## Kin Score — 12.7 / 100 (emerging)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 12.7).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 7.1 |
| Commercial Clarity | 31.6 |
| Access Clarity | 31.6 |

Regulatory layer — **Energy & Utilities**: 18.9 (matched via tags).

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Security (1)

- **Heirloom Domain Security** — TLSv1.3 · HSTS

## Tags

Company, Carbon Removal, Direct Air Capture, Climate Technology, Carbon Credits, Sustainability, Energy, Climate

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/heirloom/). Scores are computed from the provider's own public artifacts under a published rubric.